Setting the Standard

Mercury Marine was the first engine manufacturer to develop oils that meet the National Marine Manufacturers Association (NMMA) FC-W standards for four-cycle engines. All of our synthetic-blend oils contain specially designed additives to reduce friction, improve performance, and protect against engine wear and internal corrosion.

http://www.mercurymarine.com/en-gb/nz/parts-and-accessories/mercury-marine-products/precision-lubricants/